本文選題：自激混頻器 + C與Ku波段��； 參考：《電子科技大學(xué)》2016年碩士論文

【摘要】：混頻器作為現(xiàn)代無線通信系統(tǒng)中的重要組成部分,其性能的好壞會(huì)直接影響整個(gè)通信系統(tǒng)的優(yōu)劣。自100多年前混頻器被發(fā)明以來,其在當(dāng)代通信系統(tǒng)中的應(yīng)用越來越廣泛。因此,對(duì)混頻器的研究具有重要的意義。本文主要依據(jù)自激混頻器理論,研究并設(shè)計(jì)了無需外部振蕩源的單管自激混頻器,并以此為基礎(chǔ),完成了C與Ku波段鏡像抑制混頻器的設(shè)計(jì)。本文中的單管自激混頻器不僅能夠起到混頻的作用,還能夠自激產(chǎn)生本振信號(hào),從而降低了混頻器對(duì)外部本振源的依賴。首先,為了使混頻器能夠自激產(chǎn)生振蕩信號(hào),本文根據(jù)并聯(lián)反饋式振蕩器的基本原理,采用基片集成波導(dǎo)諧振器作為選頻網(wǎng)絡(luò),實(shí)現(xiàn)了振蕩頻率為9.9GHz左右的振蕩器。然后,本文在振蕩器中加入射頻輸入端口和中頻輸出端口,并對(duì)兩個(gè)端口的匹配網(wǎng)絡(luò)進(jìn)行設(shè)計(jì),實(shí)現(xiàn)了單管自激混頻器。最后,通過在自激混頻器的射頻輸入端接入鏡像抑制濾波器,完成了C與Ku波段鏡像抑制混頻器設(shè)計(jì)。實(shí)物測試結(jié)果表明,當(dāng)漏極直流電壓為2.5V,源極直流電壓為-0.35V,輸入信號(hào)頻率范圍為6.9GHz-8.0GHz時(shí),射頻與中頻端的隔離度大于26dB,變頻增益大于2.1dB,鏡像抑制度大于38dB。為了使自激混頻器產(chǎn)生的振蕩信號(hào)性能更好,本文對(duì)振蕩信號(hào)進(jìn)行了鎖相。首先通過在基片集成波導(dǎo)中加載變?nèi)荻䴓O管,使振蕩信號(hào)能夠在9.92GHz±21MHz的頻率范圍內(nèi)電壓可控。然后,將這個(gè)可調(diào)諧的自激混頻器與分頻器、鎖相芯片、環(huán)路濾波器聯(lián)合起來,在ADISimPLL仿真軟件中完成鎖相電路的仿真。最后,通過穩(wěn)壓芯片為鎖相電路提供直流電源,進(jìn)而完成整個(gè)電路的設(shè)計(jì)。實(shí)測結(jié)果表明,當(dāng)輸入頻率為7GHz-8.4GHz時(shí),變頻增益大于2.3d B,相噪為10kHz@-87.7dBc/Hz、100kHz@-107.7dBc/Hz and 1MHz@-113.3dBc/Hz。本文采用了多種仿真軟件進(jìn)行自激混頻器、鏡像抑制混頻器以及鎖相電路的設(shè)計(jì)。經(jīng)過仿真和優(yōu)化,采用PCB工藝對(duì)其加工,進(jìn)而得到最終的電路實(shí)物。通過測試,其結(jié)果與仿真結(jié)果是吻合的,從而驗(yàn)證了本文設(shè)計(jì)方案的可行性,以及理論分析的正確性。
[Abstract]:As an important part of modern wireless communication system, mixer performance will directly affect the quality of the whole communication system. Since the invention of mixer more than 100 years ago, it has been used more and more widely in modern communication systems. Therefore, the study of mixer is of great significance. Based on the theory of self-excited mixer, a single-transistor self-excited mixer without external oscillation source is studied and designed in this paper. Based on this, the design of C and Ku-band mirror rejection mixer is completed. The single-transistor self-excited mixer in this paper can not only play the role of mixing, but also generate local oscillator signal by self-excitation, thus reducing the dependence of mixer on external local oscillator source. Firstly, in order to make the mixer self-excited to generate oscillatory signals, the oscillator with oscillating frequency about 9.9GHz is realized by using the substrate integrated waveguide resonator as the frequency selective network according to the basic principle of the parallel feedback oscillator. Then, the RF input port and if output port are added to the oscillator, and the matching network between the two ports is designed to realize the single-transistor self-excited mixer. Finally, the design of the C and Ku-band mirror rejection mixer is completed by inserting the mirror suppression filter into the RF input of the self-excited mixer. The physical test results show that when the drain voltage is 2.5V, the source DC voltage is -0.35V, and the input signal frequency range is 6.9GHz-8.0GHz, the isolation between RF and if is more than 26dB, the frequency conversion gain is more than 2.1dBand the mirror rejection is more than 38dB. In order to improve the performance of the oscillation signal generated by the self-excited mixer, the phase-locked oscillating signal is carried out in this paper. Firstly, by loading a varactor diode into the substrate integrated waveguide, the oscillation signal can be controlled in the frequency range of 9.92GHz 鹵21MHz. Then, the tunable self-excited mixer is combined with the divider, the phase-locked chip and the loop filter to simulate the phase-locked circuit in the ADISimPLL simulation software. Finally, the DC power supply is provided to the phase locked circuit by the voltage stabilizer chip, and the design of the whole circuit is completed. The measured results show that when the input frequency is 7GHz-8.4GHz, the frequency conversion gain is greater than 2.3 dB, and the phase noise is 10kHz @ -87.7dBc / Hz-107.7dBc / Hz and 1MHz Bc / Hz. In this paper, a variety of simulation software is used to design self-excited mixer, mirror rejection mixer and phase-locked circuit. After simulation and optimization, PCB process is used to process it, and the final circuit is obtained. The experimental results are in good agreement with the simulation results, which verifies the feasibility of the design scheme and the correctness of the theoretical analysis.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TN773

【參考文獻(xiàn)】

相關(guān)博士學(xué)位論文 前1條

1 郝張成;基片集成波導(dǎo)技術(shù)的研究[D];東南大學(xué);2006年

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本文編號(hào)：1982123